Turnbull Addresses National Security Concerns On The Anniversary Of 9/11

He says we have to change the way we respond to terrorism.

ASSOCIATED PRESSMalcolm Turnbull says the nature of terrorism is changing.

Prime Minister Malcolm Turnbull has addressed national security concerns, after a 22-year-old man was charged with committing a terrorist act following an alleged stabbing in Sydney's west on Saturday afternoon.

He spoke on the 15th anniversary of the September 11 attacks on the World Trade Centre, comparing the two and addressing the changing face of terrorism.

Turnbull said the two events were not only connected by violent Islamist ideologies but also by the heroism of first responders at the scene.

"Connecting them both is a violent Islamist ideology, which perverts the religion of Islam and seeks to destroy and threaten our way of life."

He said that terrorism is changing and that our response needs to change as well.